The grain sizes for CBN and diamond grains are also regulated by the FEPA standard. The grain size number does not specify the number of openings in a mesh screen as with conventional grinding wheels; instead, it is the nominal mesh size, that is, the maximum grain diameter in my. This means, for example, that the maximum grain diameter of the grain is 0.151 mm for grain size B151.
Please refer to the following table for the available grain sizes for CBN and diamond (Table 2.1.3).
